chore: add a CI check for typos

[zeke]

Summary

This PR adds a new job to CI to check for typos.

Tooling

https://github.com/crate-ci/typos is a Rust CLI built for source trees that mix prose and code.

• Curated dictionary. It checks "is this string a known misspelling" (teh → the, recieve → receive) rather than "is this a real English word." It doesn't need a huge custom dictionary of product names and jargon to be useable.
• Identifier-aware. It splits camelCase, snake_case, and kebab-case into sub-words before checking, so code identifiers like getAttr don't get flagged as a whole.
• Fast. Runs in about 2 seconds on my machine, so it won't add meaningful time to CI.
• Actively maintained. Hecka GitHub stars, regular releases, and it's used across a lot of big repos.

Configuration

I ran this locally against the whole content tree first: 505 raw hits. Most were noise — 43% came from one directory of third-party OSS license text alone (legal/3rdparty.*), plus base64/JWT example tokens, hex hashes, foreign-language UI string examples, and real acronyms (HELO, EDE, HPE). _typos.toml excludes the license directory, ignores long base64/hex runs by regex, and allowlists about 45 specific words/identifiers I confirmed by hand aren't typos. After that tuning, it's now down to zero findings on the production branch.

Here's a companion PR with the actual typos it found: #33375 -- once that's merged, this PR should turn green. 🍏

✋🏼 This PR conforms to the contribution guidelines.

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/.github/	@ahaywood, @colbywhite, @MohamedH1998, @mvvmm, @cloudflare/content-engineering
*	@cloudflare/product-owners

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[mvvmm]

sweet

[zeke]

#33375 just landed, so the production branch should now be typo-free.

Rebasing this. Let's see if it turns green. 🤞🏼

[cloudflare-docs-bot]

Review

✅ No issues found in commit 987e1e1.

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